5.3 Restrictor Replacement
1. Turn off the safety lockout air valve located at the front of the pressure vessel
and lock it out. (sideway position)
TURN OFF THE SOURCE OF COMPRESSED AIR TO THE UNIT.
2. Vent the pressurized air from the delivery unit using the vessel valve located
on the top of the pressure vessel unit. Turn valve slowly (earplugs
recommended) releasing air pressure.
CHECK TO MAKE SURE SYSTEM IS TOTALLY DEPRESSURIZED.
DISCONNECT UNIT FROM COMPRESSED AIR SUPPLY.
3. Using a medium sized pipe wrench, loosen the union pipefitting that attaches
the control unit to the bottom of the pressure vessel.